[gmx-users] Athlon SSE vs. 3Dnow

[David van der Spoel]

On Thu, 2002-11-14 at 13:30, Anton Feenstra wrote:
> Hi,
> 
> 
> I noticed that on our old, single Athlon 1GHz nodes mdrun uses the
> 3Dnow instructions, while on the new, dual Athlon 1.3GHz it uses the
> SSE instructions. My feeling is that the (Athlon specific) 3Dnow would
> be faster. So, why is SSE used? Is SSE (if available - the 1GHz CPU's 
> don't have it) or 3Dnow faster on Athlons?

Eric tested it, and SSE is faster. So 3DNow will not be developed much
more.
> 
> 
> -- 
> Groetjes,
> 
> Anton
>  ________ ___________________________________________________________
> |        | Anton Feenstra                                            |
> | .      | Dept. of Pharmacochemistry - Vrije Universiteit Amsterdam |
> | |----  | De Boelelaan 1083 - 1081 HV Amsterdam - The Netherlands   |
> | |----  | Tel: +31 20 44 47608 - Fax: +31 20 44 47610               |
> | ' __   | Feenstra at chem.vu.nl - http://www.chem.vu.nl/afdelingen/FAR|
> |  /  \  |-----------------------------------------------------------|
> | (    ) | Dept. of Biophysical Chemistry - University of Groningen  |
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> |   __   | Tel +31 50 363 4327 - Fax +31 50 363 4800                 |
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-- 
Groeten, David.
________________________________________________________________________
Dr. David van der Spoel, 	Biomedical center, Dept. of Biochemistry
Husargatan 3, Box 576,  	75123 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://xray.bmc.uu.se/~spoel
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